function phoneFilter(form, format) {

	var input = form.value;

	if(input.length > 0) { //do not perform if empty input

		var numbers = ""; //store all the numbers here

		//process to remove non-numbers and spaces
		for(var i = 0; i < input.length; i++) {
			var myChar = input.charAt(i);
			//numbers += myChar;
			if(!(isNaN(myChar) || myChar == " ")) numbers += myChar;
		}

		//remove country code, if any
		if(numbers.substring(0, 1) == "1") numbers = numbers.substring(1, numbers.length);

		var output = ""; //assign numbers here

		//assign numbers to chosen format
		var n = 0, i = 0;
		while(i < format.length && n < numbers.length) {
			var myChar = format.charAt(i);
			if(myChar == "#") {
				output += numbers.charAt(n++)
			} else {
				output += myChar;
			}
			i++;
		}

		//give alert if length is less than 8.
		if(numbers.length < 10 || numbers.length > 11) {
			alert("Please enter a 10 digit number.");
			form.focus();
			//form.select();
		}

		form.value = output; //output to form
	}
}

function replace(string,text,by) {
// Replaces text with by in string

    var strLength = string.length, txtLength = text.length;
    if ((strLength == 0) || (txtLength == 0)) return string;

    var i = string.indexOf(text);
    if ((!i) && (text != string.substring(0,txtLength))) return string;
    if (i == -1) return string;

    var newstr = string.substring(0,i) + by;

    if (i+txtLength < strLength)
        newstr += replace(string.substring(i+txtLength,strLength),text,by);

    return newstr;
}